A(n)=6n-20

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Solution for A(n)=6n-20 equation: 



(A)=6A-20

We move all terms to the left:

(A)-(6A-20)=0

We get rid of parentheses

A-6A+20=0

We add all the numbers together, and all the variables

-5A+20=0

We move all terms containing A to the left, all other terms to the right

-5A=-20

A=-20/-5

A=+4

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